Mount for inlet check valve

ABSTRACT

According to the present disclosure, a fuel-delivery control system is provided for regulating flow through a filler neck into a fuel tank. The system includes a valve mount coupled to the fuel tank and formed to include a fuel-delivery channel and an inlet check valve positioned to lie in the fuel-delivery channel.

PRIORITY CLAIM

This application claims priority under 35 U.S.C. §119(e) to U.S.Provisional Application Ser. No. 61/326,090, filed Apr. 20, 2010, whichis expressly incorporated by reference herein.

BACKGROUND

The present disclosure relates to a fuel tank valve assembly, andparticularly to a fuel tank valve assembly that is suitable for use witha fuel tank having an exterior skin made of a polymeric material. Moreparticularly, the present disclosure relates to a valve assembly havinga mount adapted to be welded to the fuel tank to mount the valve in afixed position in an aperture formed in the fuel tank.

SUMMARY

According to the present disclosure, a fuel-delivery control system isprovided for regulating flow through a filler neck into a fuel tank. Thesystem includes a valve mount coupled to the fuel tank and formed toinclude a fuel-delivery channel and an inlet check valve positioned tolie in the fuel-delivery channel.

In illustrative embodiments, the valve mount includes a fuel-vaporblockade insert made of a material that is impermeable to flow of fuelvapor and encapsulated in a shell. The shell is made of a plasticsmaterial that can be welded to the fuel tank to retain the valve mountin a stationary position on the fuel tank. The fuel-vapor blockadeinsert is positioned to lie very close to an impermeable inner tanklayer included in the fuel tank to provide means for minimizing flow offuel vapor from the fuel tank to the surroundings through a channel thatis formed between the fuel-vapor blockade insert and the impermeableinner tank layer and filled with weldable plastics material included inan outer tank layer of the fuel tank that is welded to the shell of thevalve mount so that unwanted discharge of fuel vapor from the fuel tankto the surroundings past the valve mount is minimized.

Additional features of the present disclosure will become apparent tothose skilled in the art upon consideration of illustrative embodimentsexemplifying the best mode of carrying out the disclosure as presentlyperceived.

BRIEF DESCRIPTION OF THE DRAWINGS

The detailed description particularly refers to the accompanying figuresin which:

FIG. 1 is a partial side elevational view of a portion of a vehicle fuelsystem with portions broken away to show a fuel-delivery control unit inaccordance with the present disclosure positioned in a fuel tank fillerneck at an inlet opening into an interior region formed in a vehiclefuel tank;

FIG. 2 is an enlarged view of the fuel-delivery control unit of FIG. 1with portions broken away to show a valve mount comprising a shell madeof a weldable plastics material and a fuel-vapor blockade insertdisposed in the shell and showing that the shell includes a conduit thatis formed to include a fuel-delivery channel communicating with theinterior region of the vehicle fuel tank and containing an inlet checkvalve providing means for normally closing the fuel-delivery channeluntil a sensor included in the inlet check valve is exposed to liquidfuel flowing from the filler neck through the fuel-delivery channeltoward the interior region of the fuel tank and showing that the shellfurther includes an outwardly extending conduit anchor coupled to anexterior surface of the conduit and formed to include an annular weldpad that is coupled to the fuel tank (e.g., by welding) to support theconduit in the inlet formed in the fuel tank;

FIG. 3 is an enlarged partial sectional view of the valve mount of FIGS.1 and 2 and a side wall of the fuel tank before they are mated showingthat an illustrative fuel tank side wall includes an outer tank layermade of a weldable plastics material and an inner tank layer made of abarrier material that is impermeable to flow of fuel tank vapor;

FIG. 4 is a view similar to FIG. 3 showing that a weld pad made ofhigh-density polyethylene (HDPE) and included in the conduit anchor ofthe shell has been mated with and welded to the outer tank layer (alsomade of HDPE) of the fuel tank to anchor the valve mount of thefuel-delivery control unit in the inlet formed in the side wall of thefuel tank;

FIG. 5 is an enlarged view of a portion of the vehicle fuel system shownin FIG. 4 and showing that the fuel tank includes an outer tank layermade of a weldable plastics material such as HDPE and an inner tanklayer made of an impermeable barrier material configured to block flowof liquid fuel and fuel vapor therethrough and showing that the weld padof the conduit anchor is coupled to the outer tank layer to minimize adistance between a lower edge of the fuel-vapor blockade insert and atop surface of the inner tank layer to inhibit any flow of fuel vaporfrom the interior region of the fuel tank to the surroundings through aspace provided between the lower edge of the fuel-vapor blockade insertand the top surface of the inner tank layer and filled with HDPEplastics material;

FIG. 6 is a diagrammatic sectional view of a plastic injection moldhaving an upper mold portion and a lower mold portion, here shown spacedapart in an opened position, and showing a fuel-vapor blockade insertmade of a metal impermeable to liquid fuel and fuel vapor locatedbetween the upper and lower mold portions and adapted to set on aninsert carrier formed in a central region of the lower mold portion (assuggested in FIG. 7) prior to closing the mold and injecting an HDPEplastics material into a mold cavity formed in the upper and lower moldportions (in the manner shown in FIG. 7);

FIG. 7 is a sectional view similar to FIG. 6 showing the upper and lowermold portions in a closed position after the HDPE plastics material hasbeen injected into the mold cavity through a channel formed in the uppermold portion so as to overmold the HDPE plastics material onto the metalfuel-vapor blockade insert to encapsulate the insert in a shell made ofthe HDPE plastics material;

FIG. 8 is a perspective view of the valve mount produced in the plasticinjection mold of FIG. 7 with portions broken away to show a portion ofthe metal fuel-vapor blockade insert encapsulated in the HDPE shell andbefore an inlet check valve is mounted in the fuel-delivery channelformed in the shell;

FIG. 9 is a plastic injection mold similar to the mold shown in FIG. 7except that it is not configured to receive and support a fuel-vaporblockade insert in the mold cavity; and

FIG. 10 is a perspective view of the valve mount made in accordance withanother embodiment of the present disclosure and produced in the plasticinjection mold of FIG. 9 with portions broken away to show that thevalve mount is monolithic.

DETAILED DESCRIPTION

A fuel system 10 for use with a vehicle is shown in FIG. 1. Fuel system10 includes a fuel tank 12, a filler neck 14, and a fuel-deliverycontrol unit 16 comprising a valve mount 18 coupled to fuel tank 12 andarranged to extend outwardly in one direction into filler neck 14 andinwardly in an opposite direction into an interior region 20 of fueltank 12 and an inlet check valve (V) 22 located in a fuel-deliverychannel 24 formed in valve mount 18 as suggested in FIGS. 1 and 2. Valvemount 18 includes a shell 26 having a conduit 28 providing fuel-deliverychannel 24 and a conduit anchor 30 coupled to fuel tank 12 to supportconduit 28 in an inlet 32 formed in fuel tank 12. A fuel-vapor blockadeinsert 34 is included in valve mount 18 and disposed in shell 26 assuggested in FIGS. 1-5 in accordance with a first embodiment of thepresent disclosure using an illustrative overmolding process suggestedin FIGS. 6-7 and is omitted from shell 126 of a fuel-delivery controlsystem 116 as suggested in FIGS. 9 and 10 to produce a valve mount 118in accordance with another embodiment of the present disclosure.

Fuel tank 12 includes an outer tank layer 121 and an inner tank layer122 coupled to an interior surface of outer tank layer 121 as shown, forexample, in FIGS. 1-5. Outer tank layer 121 is made of a weldableplastics material such as high-density polyethylene (HDPE) in anillustrative embodiment. Inner tank layer 122 is made of an impermeablebarrier material configured to define interior region 20 and to providemeans for blocking flow of liquid fuel and fuel vapor therethrough frominterior region 20 to the surroundings outside of fuel tank 12. Anaperture formed in outer tank layer 121 is aligned with an apertureformed in inner tank layer 122 to define fuel tank inlet 32 as suggestedin FIGS. 1-5.

Shell 26 included in valve mount 18 is made of a weldable plasticsmaterial such as HDPE in an illustrative embodiment. Shell 26 is adaptedto be coupled, for example, using a welding process, to outer tank layer121 of fuel tank 12 as suggested in FIGS. 3 and 4 to extend through fueltank inlet 32 into interior region 20 and to support inlet check valve22 located in fuel-delivery channel 24 of shell 26 in fluidcommunication with interior region 20 of fuel tank 12 as shown, forexample, in FIG. 2.

Conduit 28 of shell 26 includes an inner end 281 arranged to extendthrough fuel tank inlet 32 into interior region 20 of fuel tank 12 andan outer end 282 positioned to lie outside interior region 20 and inspaced-apart relation to outer tank layer 121 as shown, for example, inFIG. 2. A lower housing 36 included in fuel-delivery control unit 16 isformed to include a flow-discharge passageway 38 and configured to becoupled to inner end 281 using, for example, a snap-on connector 36C assuggested in FIGS. 1 and 2 to provide guide means for conducting anyliquid fuel (not shown) flowing out of fuel-delivery channel 24 and intoflow-discharge passageway 38 in a downward direction 39 toward a floor12 f of fuel tank 12. Outer end 282 of conduit 28 is adapted to matewith an inner end 141 of fuel tank filler neck 14 as shownillustratively in FIG. 1 and diagrammatically in FIG. 2. An outer end142 of filler neck 14 is configured to be closed temporarily by aremovable closure 40 of any suitable kind as suggested in FIGS. 1 and 2.

Conduit anchor 30 of shell 26 includes horizontal and vertical rings 42,43 as suggested in FIGS. 2 and 3. Horizontal ring 42 is coupled to anexterior surface of conduit 28 and is arranged to surround and extendlaterally away from conduit 28 as suggested in FIG. 3. Vertical ring 43is coupled to a peripheral portion of horizontal ring 42 and is arrangedto surround a lower portion 281 of conduit 28 and lie in concentricrelation to lower portion 28L as suggested in FIG. 3. An annular freeend 431 of vertical ring 43 provides a weld pad that is adapted to matewith outer tank layer 121 of fuel tank 12 as suggested in FIGS. 2 and 3to cause lower portion 28L of conduit 28 to extend through fuel throughfuel tank inlet 32 and to suspend inner end 281 of conduit 28 andhousing 36 in interior region 20 of fuel tank 12.

In illustrative embodiments, a fuel-vapor blockade insert 34 is includedin valve mount 18 of fuel-delivery control unit 16 and disposed (forexample, encapsulated) in shell 26 as suggested in FIGS. 1-4. Fuel-vaporblockade insert 34 is made an impermeable barrier material such as ametal that is configured to provide means for blocking flow of liquidfuel and fuel vapor therethrough.

Fuel-vapor blockade insert 34 includes a cylindrical upper sleeve 341having a first diameter, a cylindrical lower sleeve 343 having arelatively greater second diameter, and an annular disk 342 extendinglaterally and radially and interconnecting a lower end of upper sleeve341 and an upper end of lower sleeve 343 as suggested in FIGS. 2-4. Inillustrative embodiments, upper sleeve 341 is encapsulated in an upperportion 28U of conduit 28, annular disk 342 is encapsulated inhorizontal ring 42 of conduit anchor 30, and lower sleeve 343 isencapsulated in vertical ring 43 of conduit anchor 30 and terminates atbottom surface 344 as shown, for example, in FIGS. 2-5.

Bottom surface 344 of lower sleeve 343 of fuel-vapor blockade insert 34and exterior surface 122 e of inner tank layer 122 cooperate to definean annular channel 50 of height D therebetween as suggested in FIG. 5.As suggested in FIG. 5, in an illustrative embodiment, the entireannular channel 50 is filled with plastics material (for example, HDPE)included in outer tank layer 121. Fuel-vapor blockade insert 34 islocated relative to exterior surface 122 e of inner tank layer 122 tominimize or eliminate distance D so that the height of annular channel50 is as small as possible to restrict any outbound flow of fuel vapor52 from interior region 20 of fuel tank 12 to the atmosphere surroundingfuel-delivery control unit 16 that has passed through the vaporpermeable material comprising outer tank layer 121 that lies in annularchannel 50. In illustrative embodiments, such outbound fuel vapor flowpermeating outer tank layer 121 and flowing through annular channel 50is minimized and in compliance with certain applicable governmentalregulations so as to reduce permeation of fuel vapor 52 from interiorregion 20 of fuel tank 12 to the atmosphere surrounding fuel tank 12.

A lower portion of vertical ring 43 of conduit anchor 30 provides a weldpad 431 that is adapted to be coupled to fuel tank 12 (as by, forexample, welding) at fuel tank inlet 32 as suggested in FIGS. 3 and 4. Ahot-plate (or other suitable) welding process can be used, for example,to couple the annular weld pad 43 of vertical ring 43 of conduit anchor30 to outer tank layer 121 of fuel tank to provide an annularlow-permeation joint therebetween to minimize unwanted fuel vaporleakage therebetween. It is within the scope of the present disclosureto make that weld pad 431 of any suitable material that can be welded orotherwise coupled to outer tank layer 121 of fuel tank 12 to provide asubstantially sealed connection therebetween.

Using an illustrative technique, the annular weld pad 431 established bythe lower portion of vertical ring 43 is moved downwardly in direction54 as suggested in FIG. 3 to contact an exterior surface 121 e of outertank layer 121 of fuel tank 12. Annular weld pad 431 and outer tanklayer 121 are heated during a welding operation. After treating bothsurfaces 121 e and 431 with heat 56 during a conductive heat-transferprocess, as suggested in FIG. 3, the two surfaces 121 e and 431 arepressed together using, for example, a downwardly moving shell mover 58to form a sealed weld joint and locate bottom surface 344 of lowersleeve 343 of fuel-vapor blockade insert 34 at distance D from exteriorsurface 122 e of inner tank layer 122.

One illustrative method of disposing (for example, encapsulating)fuel-vapor blockade insert 34 in shell 26 to produce valve mount 18 isillustrated in FIGS. 6-8. A plastics material injector 60 is used tointroduce a weldable plastics material 62 (for example, HDPE) into amold cavity containing fuel-vapor blockade insert 34 and defined inupper and lower mold portions 64, 66 to overmold shell 26 ontofuel-vapor blockade insert 34. A series of circumferentiallyspaced-apart upstanding insert-support pins 68 are coupled to anunderlying block 70 to define an insert carrier on block 70 and toprovide lower mold portion 66. Pins 68 are configured to provideinsert-carrier means for supporting fuel-vapor blockade insert 34 in anelevated position in the mold cavity as suggested in FIG. 7 duringdischarge of weldable plastics material 62 into the mold cavity to formbottom surface 344 and other underside portions of horizontal andvertical rings 42, 43 of conduit anchor 30 of shell 26.

In accordance with the present disclosure, a pre-mold insert 34 islocated strategically within shell 26 and geometry of weld pad 43 isselected to minimize any full-vapor permeable area (for example, annularchannel 50) after valve mount 18 is welded to fuel tank 12. A mechanicallock is provided between shell 26 and insert 34 arising out of theovermold design disclosed herein. It is within the scope of thisdisclosure to surface treat insert 34 to provide a chemical bond betweenshell 26 and insert 34. By forming a shell 126 with an insert 34 toproduce a valve mount 118 as suggested in FIGS. 9 and 10, a low-costgovernmental LEVEL I-compliant fuel-delivery control unit 116 isprovided.

In accordance with the present disclosure, no additional components orsecondary processes to fuel-delivery control system 16 are needed tocause system 16 to comply with governmental LEVEL III regulations (i.e.,sulfination, exotic materials, two-shot process, etc.). Fuel tanksuppliers are not required to use any secondary process on fuel tankscoupled to system 16 to achieve LEVEL III compliance.

As disclosed herein, providing an insert 34 extending into weld pad 431ensures that height D (representative of permeable cross-sectional areaof annular channel 50) will be minimized or eliminated during thewelding process as bottom surface 344 of lower sleeve 43 of insert 34 islocated very near to or in contact with exterior surface 122 e of innertank layer 122 of fuel tank 12 as suggested in FIGS. 4 and 5. Withinsert 34 being strategically placed within weld pad 431 in accordancewith the present disclosure, the weld strength between valve mount 18and fuel tank 12 will be maximized. In this welding process, bottomsurface 344 of insert 34 is forced to make or nearly make contact withthe permeation barrier established in fuel tank 12 by inner tank layer122 to remove any hydrocarbon leak path therebetween or to provide amore stringent hydrocarbon leak path through annular channel 50 incompliance with governmental LEVEL III regulations.

1. A fuel system comprising a fuel-delivery control unit including avalve mount adapted to be coupled to and interconnect a fuel tank and afuel tank filler neck, the valve mount being formed to include afuel-delivery channel arranged to conduct liquid fuel and fuel vaporbetween an interior region formed in the fuel tank and a passagewayformed in the fuel tank filler neck, the fuel-delivery control unitfurther including an inlet check valve positioned to lie in thefuel-delivery channel and configured to regulate flow of liquid fuelthrough the fuel-delivery channel between the fuel tank and the fueltank filler neck, wherein the valve mount includes a shell made of aweldable plastics material and a fuel-vapor blockade insert encapsulatedin the shell and made of a material that is impermeable to flow of fuelvapor.
 2. The fuel system of claim 1, further comprising a fuel tankformed to include an inlet opening into the interior region, an innertank layer made of an impermeable barrier material surrounding theinterior region and configured to provide means for blocking flow ofliquid fuel and fuel vapor therethrough from the interior region tosurroundings outside of the fuel tank, and an outer tank layer made of aweldable plastics material compatible and configured to merge with theweldable plastics material of the shell of the valve mount during awelding operation to unite the shell and the outer tank layer to fix thevalve mount in a stationary position on the fuel tank, and wherein anaperture formed in the outer tank layer is aligned with an apertureformed in the inner tank layer to define the inlet of the fuel tank, andthe shell is positioned to lie in a stationary position relative to theouter tank layer to cause the fuel-vapor blockade insert in the shell tolie in close proximity to the inner tank layer to provide means forminimizing flow of fuel vapor from the fuel tank to the surroundingsthrough a channel that is formed between the fuel-vapor blockade insertand the inner tank layer and that is filled with weldable plasticsmaterial included in at least one of the outer tank layer and the shellso that unwanted discharge of fuel vapor from the interior region of thefuel tank to the surroundings past the valve mount is minimized.
 3. Thefuel system of claim 2, wherein the shell includes a conduit that isformed to include the fuel-delivery channel and an outwardly extendingconduit anchor coupled to the conduit and formed to include an annularweld pad that is coupled to the outer tank layer of the fuel tank tosupport the conduit in the inlet formed in the fuel tank to place thefuel-delivery conduit in fluid communication with the interior region ofthe fuel tank.
 4. The fuel system of claim 3, wherein the fuel-vaporblockade insert includes an upper sleeve, a lower sleeve having a bottomsurface, and a disk extending laterally away from the upper sleeve tomate with the lower sleeve, the upper sleeve is disposed in the conduit,the disk and the lower sleeve are disposed in the conduit anchor, and abottom surface of the lower sleeve cooperates with a top surface of theinner tank layer to define the channel therebetween.
 5. The fuel systemof claim 3, wherein the conduit of the shell includes an inner endarranged to extend through the inlet of the fuel tank into the interiorregion of the fuel tank and an outer end arranged to lie outside of theinterior region of the fuel tank and in spaced-apart relation to theouter tank layer and adapted to mate with a fuel tank filler neck. 6.The fuel system of claim 5, wherein the conduit anchor of the shellincludes a horizontal ring coupled to an exterior surface of the conduitand arranged to surround and extend laterally away from the conduit anda vertical ring coupled to a peripheral portion of the horizontal ringand arranged to surround and lie in spaced-apart relation to a lowerportion of the conduit, and a free end of the vertical ring provides theannular weld pad.
 7. The fuel system of claim 6, wherein the fuel-vaporblockade insert includes an upper sleeve disposed in the conduit, alower sleeve disposed in the vertical ring of the conduit anchor, and anannular disk disposed in the horizontal ring of the conduit anchor andarranged to interconnect the upper and lower sleeves.
 8. The fuel systemof claim 2, wherein the shell includes a vertical ring coupled to theouter tank layer, the fuel-vapor blockade insert includes a lower sleevehaving a bottom surface, and the lower sleeve is disposed in thevertical ring to locate the bottom surface in spaced-apart relation to atop surface of the inner tank layer to define the channel therebetween.9. The fuel system of claim 8, wherein the shell further includes aconduit that is formed to include the fuel-delivery channel and ahorizontal ring coupled to an exterior surface of the conduit and anupper portion of the vertical ring and arranged to surround and extendlaterally away from the conduit, the horizontal and vertical rings ofthe shell cooperate to form a conduit anchor arranged and configured tosupport the conduit in the inlet formed in the fuel tank, and thefuel-vapor blockade insert further includes an upper sleeve disposed inthe conduit and a disk disposed in the horizontal ring of the shell andarranged to extend laterally away from the upper sleeve to mate with thelower sleeve.
 10. The fuel system of claim 9, wherein the upper sleeveis cylindrical and has a first diameter, the lower sleeve is cylindricaland has a relatively greater diameter, and the disk is annular.
 11. Thefuel system of claim 9, wherein the conduit of the shell includes aninner end arranged to extend through the inlet of the fuel tank into theinterior region of the fuel tank and an outer end arranged to lieoutside of the interior region of the fuel tank and in spaced-apartrelation to the outer tank layer and adapted to mate with a fuel tankfiller neck, and further comprising a lower housing formed to include aflow-discharge passageway and configured to be coupled to the inner endof the conduit to provide guide means for conducting any liquid fuelflowing out of the fuel-delivery channel and into the flow-dischargepassageway in a downward direction into the interior region of the fueltank and toward a floor of the fuel tank.
 12. The fuel system of claim11, wherein the lower housing is made of a plastics material that isdifferent from the weldable plastics material included in the conduit ofthe shell.
 13. The fuel system of claim 11, wherein the lower housing iscoupled to the inner end of the conduit by means of a snap-on connector.14. The fuel system of claim 1, wherein the shell includes a conduitthat is formed to include the fuel-delivery channel and an outwardlyextending conduit anchor coupled to the conduit and adapted to becoupled to the fuel tank.
 15. The fuel system of claim 14, wherein thefuel-vapor blockade insert is disposed in each of the conduit and theconduit anchor.
 16. The fuel system of claim 15, wherein the fuel-vaporblockade insert includes an upper sleeve, a lower sleeve, and an annulardisk extending laterally away from the upper sleeve to mate with theupper sleeve, the upper sleeve is disposed in the conduit, and the lowersleeve and disk are disposed in the conduit anchor.
 17. The fuel systemof claim 14, wherein the conduit of the shell includes an outer endadapted to mate with the fuel tank filler neck and an opposite inner endand the conduit anchor includes a horizontal ring coupled to an exteriorsurface of a middle portion of the conduit located between the inner andouter ends thereof and a vertical ring coupled to a peripheral portionof the horizontal ring and arranged to surround and lie in spaced-apartrelation to a lower portion of the conduit located between the middleportion and the inner end of the conduit.
 18. The fuel system of claim17, wherein the fuel-vapor blockade insert is disposed in each of thehorizontal ring and the vertical ring of the conduit anchor and in anupper portion of the conduit located between the outer end and themiddle portion of the conduit.
 19. A fuel system comprising a fuel tankand a fuel-delivery control unit including a valve mount coupled to thefuel tank and formed to include a fuel-delivery channel and an inletcheck valve positioned to lie in the fuel-delivery channel and toregulate flow of liquid fuel through a filler neck into a fuel tank, thevalve mount including a fuel-vapor blockade insert made of a materialthat is impermeable to flow of fuel vapor and encapsulated in a shell,the shell is made of a plastics material that is welded to the fuel tankto retain the valve mount in a stationary position on the fuel tank, thefuel-vapor blockade insert is positioned to lie in close proximity to animpermeable inner tank layer included in the fuel tank to provide meansfor minimizing flow of fuel vapor from the fuel tank to the surroundingsthrough a channel that is formed between the fuel-vapor blockade insertand the impermeable inner tank layer and filled with weldable plasticsmaterial included in an outer tank layer of the fuel tank that is weldedto the shell of the valve mount so that unwanted discharge of fuel vaporfrom the fuel tank to the surroundings past the valve mount isminimized.
 20. A fuel system comprising a fuel tank, a fuel tank fillerneck, and a fuel-delivery control unit including a valve mount and aninlet check valve, the valve mount being coupled to the fuel tank andarranged to extend outwardly in one direction into the fuel tank fillerneck and inwardly in an opposite direction into an interior region ofthe fuel tank through an inlet formed in the fuel tank, the inlet checkvalve being located in a fuel-delivery channel formed in the valve mountto communicate with the interior region of the fuel tank and configuredto close the fuel-delivery channel normally until a sensor included inthe inlet check valve is exposed to liquid flowing through the fuel tankfiller neck through the fuel-delivery channel toward the interior regionof the fuel tank and a fuel-conducting passageway formed in the fueltank filler neck, wherein the valve mount includes a shell having aconduit providing the fuel-delivery channel and a conduit anchor coupledto the conduit and to the fuel tank to support a lower portion of theconduit in the inlet formed in the fuel tank, the valve mount furtherincluding a fuel-vapor blockade insert disposed in the shell, and thefuel tank including an outer tank layer made of a weldable plasticsmaterial and coupled to the conduit anchor of the shell and an innertank layer made of a barrier material impermeable to fuel vapor.